New Hampshire Tap Water Quality Report

205 cities analyzed • 751,316 people served

Updated March 2026 • Data from EWG & EPA SDWIS

205

Cities Analyzed

1.2

Avg Above Guidelines

751,316

Total Population Served

Best Water Quality

Berlin (0 above guidelines)

Most Concerns

Atkinson (10 above guidelines)

Most Common Contaminants in New Hampshire

Contaminant	Found In	% of Cities
Manganese	94 of 205	46%
Uranium carcinogen	40 of 205	20%
Perfluorooctanoic acid (PFOA) carcinogen	39 of 205	19%
Radium, combined (-226 and -228)	30 of 205	15%
Perfluorooctane sulfonate (PFOS) carcinogen	26 of 205	13%
Haloacetic acids (HAA9) carcinogen	21 of 205	10%
Chlorate	21 of 205	10%
Strontium	21 of 205	10%
Chromium (hexavalent) carcinogen	19 of 205	9%
Perfluorohexanoic Acid (PFHxA)	17 of 205	8%

City-by-City Water Quality Rankings

Ranked by number of contaminants above EWG health guidelines (most to fewest).

#	City	Detected	Above Guidelines	Above Legal	People Served
1	Atkinson	19	10	0	2,838
2	Plainview	15	9	2	123
3	Merrimack	18	8	1	25,000
4	Jaffrey	13	8	1	3,612
5	West Stewartstown	8	8	0	0
6	Portsmouth	16	6	0	33,000
7	Monroe	14	6	0	23,000
8	Nashua	13	5	1	87,682
9	Rochester	9	5	0	25,000
10	Salem	8	5	0	18,000
11	Hudson	14	5	1	16,100
12	Seabrook	10	5	0	14,000
13	Milford	13	5	1	9,500
14	Stratham	10	5	3	150
15	Dover	10	4	0	28,000
16	Durham	7	4	0	16,000
17	Rye	9	4	1	4,100
18	Londonderry	8	4	2	875
19	Newfields	4	4	1	550
20	East Kingston	5	4	0	72
21	Great Neck	5	4	1	0
22	Manchester	9	3	1	133,000
23	Concord	8	3	0	44,000
24	Derry	10	3	0	15,145
25	Exeter	12	3	0	11,000
26	Hooksett	9	3	0	3,500
27	Goffstown	9	3	1	1,100
28	Canaan	3	3	0	600
29	New Ipswich	7	3	2	112
30	Danville	3	3	2	107
31	Madbury	3	3	0	90
32	Boston	4	3	2	90
33	Fremont	3	3	2	78
34	Mashpee	3	3	1	77
35	Andover	3	3	0	75
36	Amherst	4	3	1	51
37	Keene	7	2	0	25,000
38	Lakeport	4	2	0	15,500
39	Somersworth	5	2	0	12,000
40	Lebanon	6	2	0	10,050
41	Littleton	5	2	0	6,010
42	Pembroke	3	2	0	5,200
43	Raymond	3	2	0	3,300
44	Grantham	2	2	0	3,000
45	N Swanzey	7	2	0	1,250
46	Brentwood	2	2	0	1,230
47	Bellows Falls	6	2	0	600
48	New Hampton	2	2	0	600
49	Lochmere	2	2	2	345
50	Ossipee	3	2	0	258
51	Barrington	2	2	0	250
52	Windsor	4	2	0	150
53	Bath	2	2	0	136
54	Pike	2	2	0	76
55	Waterville Valley	3	2	0	0
56	Whitefield	3	2	0	0
57	Claremont	1	1	0	9,000
58	Plymouth	2	1	0	6,300
59	Wolfeboro	1	1	0	5,750
60	Newmarket	2	1	0	5,000
61	Intervale	4	1	0	3,570
62	Bristol	3	1	0	3,400
63	Conway	2	1	0	2,665
64	Tilton	1	1	0	2,500
65	Charlestown	1	1	0	2,500
66	Rollinsford	2	1	0	1,688
67	Enfield	2	1	0	1,345
68	Madison	3	1	0	1,140
69	Lisbon	1	1	0	1,050
70	Antrim	1	1	0	920
71	Twin Mountain	1	1	0	875
72	Greenfield	1	1	0	750
73	Franconia	2	1	0	475
74	Belmont	2	1	0	413
75	El Segundo	1	1	0	388
76	Hales Location	2	1	1	385
77	Amesbury	2	1	0	298
78	Glen	2	1	0	295
79	Deering	2	1	0	245
80	Glencliff	2	1	0	230
81	Epping	2	1	0	210
82	Marblehead	1	1	0	200
83	Pittsburg	1	1	0	198
84	Las Vegas	4	1	0	198
85	Rindge	1	1	0	190
86	Hampton	2	1	0	175
87	Center Tuftonboro	1	1	0	143
88	Windham	1	1	0	127
89	Arlington	1	1	0	118
90	Kingston	2	1	0	112
91	Portland	1	1	0	108
92	Newton	1	1	0	100
93	Woburn	3	1	0	98
94	Henniker	1	1	0	91
95	Thornton	1	1	0	83
96	New Durham	1	1	0	80
97	Fitzwilliam	2	1	0	65
98	Hebron	1	1	0	65
99	North Stratford	1	1	0	50
100	Middleboro	1	1	0	48
101	Norwell	1	1	0	28
102	Hollis	2	1	0	0
103	Berlin	0	0	0	9,500
104	Hanover	1	0	0	8,500
105	Franklin	1	0	0	7,000
106	North Conway	1	0	0	5,127
107	Newport	1	0	0	5,000
108	Peterborough	1	0	0	4,062
109	Farmington	1	0	0	3,000
110	Meredith	1	0	0	2,800
111	Winchester	0	0	0	2,800
112	Lincoln	1	0	0	2,750
113	New London	1	0	0	2,750
114	Gorham	0	0	0	2,630
115	Lancaster	0	0	0	2,450
116	Hillsborough	1	0	0	2,000
117	Woodsville	1	0	0	2,000
118	Moultonborough	1	0	0	1,881
119	Hinsdale	1	0	0	1,800
120	Alton	0	0	0	1,750
121	Wilton	0	0	0	1,700
122	Bethlehem	0	0	0	1,700
123	Sunapee	0	0	0	1,640
124	Sanbornville	0	0	0	1,500
125	Northwood	0	0	0	1,300
126	Campton	0	0	0	1,250
127	Colebrook	0	0	0	1,200
128	Troy	1	0	0	1,200
129	Walpole	0	0	0	975
130	Center Ossipee	0	0	0	850
131	Gilford	1	0	0	790
132	Marlborough	0	0	0	750
133	Meriden	0	0	0	750
134	Bartlett	1	0	0	750
135	North Haverhill	0	0	0	675
136	Unity	0	0	0	625
137	Warner	0	0	0	550
138	Haverhill	0	0	0	540
139	Jackson	0	0	0	500
140	Greenville	1	0	0	472
141	East Hampstead	0	0	0	390
142	Loudon	0	0	0	370
143	Sacramento	0	0	0	350
144	Vermont	0	0	0	328
145	Swanzey	0	0	0	305
146	Stratford	0	0	0	300
147	Ashland	0	0	0	290
148	Effingham	0	0	0	280
149	West Ossipee	0	0	0	250
150	Epsom	0	0	0	226
151	Center Harbor	0	0	0	225
152	West Swanzey	1	0	0	203
153	Weare	1	0	0	200
154	Warren	0	0	0	200
155	Newbury	0	0	0	200
156	Contoocook	0	0	0	200
157	Errol	0	0	0	195
158	Holderness	0	0	0	193
159	Bedford	0	0	0	180
160	Freedom	1	0	0	163
161	Webster	0	0	0	155
162	Francestown	0	0	0	150
163	Center Conway	1	0	0	140
164	Sanbornton	1	0	0	134
165	Atkinston	0	0	0	132
166	Hill	0	0	0	130
167	Orford	0	0	0	128
168	N Quincy	0	0	0	125
169	Albany	0	0	0	125
170	E Wakefield	0	0	0	120
171	Stewartstown	0	0	0	118
172	Pelham	0	0	0	115
173	Lunenburg	0	0	0	115
174	Tamworth	0	0	0	111
175	Laconia	1	0	0	100
176	Chester	0	0	0	100
177	Sandown	0	0	0	90
178	Lawrence	1	0	0	88
179	Plaistow	0	0	0	80
180	Deerfield	0	0	0	73
181	Winnisquam	0	0	0	65
182	Northumberland	0	0	0	63
183	Northfield	1	0	0	62
184	Bennington	0	0	0	60
185	Milan	0	0	0	60
186	Lyme	0	0	0	58
187	Hopkinton	0	0	0	58
188	Milton	0	0	0	55
189	Wilmot	0	0	0	53
190	Chocorua	1	0	0	53
191	Surry	0	0	0	50
192	Brunswick	0	0	0	50
193	Bow	0	0	0	50
194	Acton	0	0	0	45
195	Alstead	0	0	0	43
196	Riverside	1	0	0	42
197	Quincy	0	0	0	40
198	N Walpole	0	0	0	40
199	Peace Dale	0	0	0	38
200	Plainville	1	0	0	35
201	Lee	0	0	0	35
202	Wenham	0	0	0	32
203	Greenland	0	0	0	30
204	Sarasota	0	0	0	29
205	N Woodstock	0	0	0	25

Recommended Filtration for New Hampshire

Based on the most common contaminants found across New Hampshire (Manganese, Uranium, Perfluorooctanoic acid (PFOA)), we recommend a reverse osmosis (RO) system — the only technology proven to remove heavy metals, PFAS, and most other contaminants to safe levels.

Echo RO System

Removes up to 99.9% of contaminants. The gold standard for drinking water in New Hampshire homes.

View RO Systems

Echo Whole-Home Filter

Protect every tap in your home from chlorine, VOCs, and disinfection byproducts.

View Whole-Home Filters

Echo Hydrogen Water Flask

Once your water is clean, supercharge it with molecular hydrogen for antioxidant and anti-inflammatory benefits.

Shop Hydrogen Flask

Frequently Asked Questions

Is New Hampshire tap water safe to drink?

Water quality varies significantly across New Hampshire. Of the 205 cities analyzed, the average city has 1.2 contaminants above EWG health guidelines. The best water quality was found in Berlin. We recommend checking your specific city's report for detailed information.

What city has the best water in New Hampshire?

Based on our analysis, Berlin has the fewest contaminants above EWG health guidelines in New Hampshire, with 0 above guideline levels.

What city has the worst water in New Hampshire?

Based on our analysis, Atkinson has the most contaminants above EWG health guidelines in New Hampshire, with 10 above guideline levels.

What's the best water filter for New Hampshire residents?

For most New Hampshire households, we recommend a reverse osmosis (RO) system for drinking water and a whole-home filter for showers and baths. The specific recommendation depends on your city's contaminant profile — check your city's report for personalized guidance.

National Water Quality Reports

Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)

Last updated: March 2026

Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.

New Hampshire Water Quality Report (2026)